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From: Jesse Barnes <jbarnes@virtuousgeek.org>
To: Matthew Garrett <mjg59@srcf.ucam.org>
Subject: Re: [RFD] Automatic suspend
Date: Tue, 17 Feb 2009 14:19:13 -0800
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Cc: mark gross <mgross@linux.intel.com>, Pavel Machek <pavel@suse.cz>,
       "Rafael J. Wysocki" <rjw@sisk.pl>,
       pm list <linux-pm@lists.linux-foundation.org>,
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       Benjamin Herrenschmidt <benh@kernel.crashing.org>,
       Nigel Cunningham <nigel@nigel.suspend2.net>,
       "Woodruff, Richard" <r-woodruff2@ti.com>, Uli Luckas <u.luckas@road.de>,
       Igor Stoppa <igor.stoppa@nokia.com>,
       Brian Swetland <swetland@google.com>, Len Brown <lenb@kernel.org>
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On Tuesday, February 17, 2009 2:04 pm Matthew Garrett wrote:
> On Tue, Feb 17, 2009 at 01:57:17PM -0800, mark gross wrote:
> > Putting the wake on key event issue aside, is it possible to have wake
> > up's on the ms time scale?  I ask because I thought the XO did exactly
> > this (but left the screen live).  Why does it take 20 sec to get into
> > or out of S3 on my laptop?
>
> Graphics reinit, dumping graphics contents back into RAM, us resuming
> devices in series, that kind of thing. On some hardware you'll spend a
> noticable amount of time in the BIOS before any of the Linux resume code
> gets touched. I thought the XO had got sub second, but I wasn't sure
> that they were in the low ms range.

IME a good chunk of it is BIOS time.  On my x200s resume is very fast (on the 
order of a second or two though I haven't measured), while on my Eee and T61 
machines it's much slower, even though they're all using Intel gfx.

Of course we should really be shooting for sub-second times or about the time 
it takes you to open your lid (or even much faster in the case of demand 
suspend/resume for servers/desktops).

-- 
Jesse Barnes, Intel Open Source Technology Center